Ladder
AssigneeDetroit Marine Engineering Corporation
InventorCharles L. Adas
Life of this patent
Estimating the term…
Abstract
A ladder is made from extruded aluminum steps supported on a pair of vertical tubes fitted through large diameter holes drilled vertically through the steps. The steps are hollow except for a pair of vertical walls extending longitudinally thereof and lying on opposite sides of the vertical holes. Small horizontal holes are drilled through these walls from the rear of the steps to receive fastening pins which are driven through the tubes to locate and support the steps on the tubes.
Claims6
A ladder including a plurality of steps each having top and bottom walls and a pair of inner transverse walls extending between said top and bottom walls, a pair of vertical openings extending through said steps between said vertical walls, a pair of tubular side rails fitted in the vertical openings of each of said steps, and fastener means projecting through said step transverse walls and each of said side rails to support and locate said steps on said side rails.
Dependencies are inferred from the claim text.